// Copyright 2024 FastLabs Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Filters for log records.

use log::LevelFilter;

pub use self::custom::CustomFilter;
pub use self::env_filter::EnvFilter;

mod custom;
pub mod reload;
pub mod env_filter;

/// The result of a filter check.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum FilterResult {
    /// The record will be processed without further filtering.
    Accept,
    /// The record should not be processed.
    Reject,
    /// No decision could be made, further filtering should occur.
    Neutral,
}

pub trait Filter: Send + Sync {
    fn enabled(&self, metadata: &log::Metadata) -> FilterResult;
    fn matches(&self, record: &log::Record) -> FilterResult;
}

impl Filter for LevelFilter {
    fn enabled(&self, metadata: &log::Metadata) -> FilterResult {
        match self.to_level() {
            None => FilterResult::Neutral,
            Some(level) => {
                if metadata.level() <= level {
                    FilterResult::Accept
                } else {
                    FilterResult::Neutral
                }
            }
        }
    }

    fn matches(&self, record: &log::Record) -> FilterResult {
        self.enabled(record.metadata())
    }
}
